Fix all those image tag errors, and then use the W3 Code Validator to check for more. You can ignore for now errors such as "An img element must have an alt attribute...", but fix an missing closing </div> tag errors. Fix the above image tag errors first, and many of the other errors and warnings will fix themselves.

2) You may also have Javascript errors. Use the developer tools in Firefox (or Firebug) or Chrome or Safari or IE to check for Javascript and other console errors. The use of those dev tools are essential for web development work.

Email codedump link for Safari and Firefox not displaying site correctly, but Chrome is working well